To upgrade Shimano 11-spd sprocket gear ratio with Relic 48T sprockets, which provide more cassette range to be compatible with Shimano 11-speed drivetrain for both SGS and GS, M8000(XT)/M9000(XTR), sprocket 11-42T, the 18T sprocket replaces 17T and 19T to make well-shifting in the cassette progression. The new combination reaches the super mega range gear ratio for optimum performance.